Orbit Fit and Astrometric record for 21RF237

The following information shows the result of the orbit fit based on Gary Bernstein's method. Most of the information should be self-explanatory. Take special note that while the original Bernstein software works with barycentric coordinates, we convert these results into a heliocentric coordinate system.

# Object: 21RF237   
# Created Tue Apr  1 01:11:26 2025
# Orbit generated from Bernstein formalism
# Fitting      8 observations of      8
# Arc:   2.11y
# First observation: 2019/08/29
#  Last observation: 2021/10/07
Preliminary a, adot, b, bdot, g, gdot:
   0.000009   0.023364   0.000000   0.001484   0.024033   0.000000
# Chi-squared of fit:     3.90 DOF:     10 RMS:  0.12
# Min/Max residuals:    -0.27    0.24
# Exact a, adot, b, bdot, g, gdot:
  1.496039E-05  2.344866E-02  1.621417E-06  1.490524E-03  2.406586E-02  2.213753E-03
# Covariance matrix:
  7.2597E-13 -1.7626E-12  1.6213E-14 -9.5332E-14 -1.2921E-12 -3.0061E-11
 -1.7626E-12  5.9471E-11 -6.6191E-13  3.8031E-12  6.5805E-11  1.1992E-09
  1.6213E-14 -6.6191E-13  6.3164E-13 -3.7738E-13 -7.3445E-13 -1.3408E-11
 -9.5332E-14  3.8031E-12 -3.7738E-13  4.9963E-13  4.2104E-12  7.7078E-11
 -1.2921E-12  6.5805E-11 -7.3445E-13  4.2104E-12  7.4416E-11  1.3276E-09
 -3.0061E-11  1.1992E-09 -1.3408E-11  7.7078E-11  1.3276E-09  2.4303E-08
#      lat0       lon0       xBary       yBary       zBary        JD0
   -1.673625   -9.095989    0.264198   -0.028299   -0.968703  2458724.712719
# Heliocentric elements and errors
Epoch:              2458720.5000  =  2019/08/25
Mean Anomaly:           62.00738 +/-     0.672
Argument of Peri:      263.16735 +/-     1.372
Long of Asc Node:       14.82554 +/-     0.007
Inclination:             3.97046 +/-     0.001
Eccentricity:         0.09810200 +/-    0.0063
Semi-Major Axis:     44.20644245 +/-    0.0282
Time of Perihelion: 2440229.1921 +/-     199.5
Perihelion:          39.86970224 +/-    0.2816
Aphelion:            48.54318267 +/-    0.2822
Period (y)              293.9250 +/-      0.28
# Ecliptic coordinates at JD0 (AU and AU/d)
Ecliptic X           41.93060709 +/-    0.0147
Ecliptic Y           -6.98727909 +/-    0.0023
Ecliptic Z           -1.21352294 +/-    0.0004
Ecliptic XDOT         0.00068365 +/-    0.0000
Ecliptic YDOT         0.00259408 +/-    0.0000
Ecliptic ZDOT         0.00016192 +/-    0.0000
# Distances at JD0 (AU)
Heliocenter to KBO   42.52611572 +/-    0.0145
Geocenter to KBO     41.55263181 +/-    0.0149
# Hcoef:  9.15

The following table shows the complete astrometric record for 21RF237. The first three columns show the date of observation. The next six columns are RA and DEC. The next column (when provided) is the observed magnitude and filter. The next column is the object name (21RF237) followed by the observatory code and reference code for the source of the astrometry.

2019 08  29.211918 23 29 13.146  -05 08 37.21  25.3r 21RF237   W84  C~7XPn      
2019 08  29.387113 23 29 12.379  -05 08 41.80  25.3r 21RF237   W84  C~7XPn      
2020 10  16.001792 23 30 36.840  -04 53 02.74  25.3r 21RF237   W84  C~7XPn      
2020 10  16.175804 23 30 36.190  -04 53 06.71  25.3r 21RF237   W84  C~7XPn      
2021 09  05.096099 23 38 18.493  -03 58 52.30  25.4r 21RF237   W84  C~7XPn      
2021 09  05.195929 23 38 18.089  -03 58 54.84  25.4r 21RF237   W84  C~7XPn      
2021 10  07.004805 23 36 00.505  -04 13 05.09  25.4r 21RF237   W84  C~7XPn      
2021 10  07.169933 23 35 59.830  -04 13 09.26  25.4r 21RF237   W84  C~7XPn      

The following table shows the residuals to the orbit fit. The first coumn is the point number. The second column is the time, in years, measured from the first observation. The third and fifth columns are the regularized positions used in the orbit fit. The fourth and sixth columns are the residuals, in arc seconds, for RA and Dec respectively.

     1   0.0000      0.00     0.09       0.00    -0.13
     2   0.0005    -12.34    -0.08       0.30     0.05
     3   1.1329   1517.90     0.04     365.14     0.21
     4   1.1334   1507.40    -0.07     365.33    -0.04
     5   2.0202   9150.71    -0.27     615.41    -0.02
     6   2.0205   9144.14     0.24     615.48    -0.04
     7   2.1076   6913.87    -0.02     652.04     0.07
     8   2.1080   6902.93     0.06     652.21    -0.10

The following table comes from a 10My integration of the orbit of the object. Three columns are shown. The first column is the result of integrating the nominal orbit. The other two columns are based on clones of the nominal orbit that are +/- 3 sigma from the nominal orbit. If all three types agree then the classificiation is deemed secure. The basis for these calculations is described in more detail in AJ, 129, 1117 (2005). Any use made of these calculations should refer to and credit this publication and the Deep Ecliptic Survey Team.

21RF237    quality flag:3

Type:      CLASSICAL CLASSICAL CLASSICAL

axisobj        44.208    44.332    44.105
ecceobj         0.095     0.110     0.079
incobj          3.966     3.965     3.967
qmin           39.426    38.876    39.963
qmax           49.104    49.847    48.238
amean          44.106    44.235    44.008
amin           43.750    43.877    43.664
amax           44.497    44.632    44.375
emean           0.087     0.102     0.073
emin            0.071     0.086     0.056
emax            0.104     0.118     0.087
imean           3.876     3.871     3.873
imin            3.133     3.102     3.146
imax            4.526     4.553     4.505
excite_mean     0.110     0.123     0.099
fracstop        1.000     1.000     1.000
cjmean          3.088     3.086     3.090

libcent 0      -180.0    -180.0    -180.0
libamp  0      -180.0    -180.0    -180.0
libcent 1      -180.0    -180.0    -180.0
libamp  1      -180.0    -180.0    -180.0
libcent 2      -180.0    -180.0    -180.0
libamp  2      -180.0    -180.0    -180.0
libcent 3      -180.0    -180.0    -180.0
libamp  3      -180.0    -180.0    -180.0
libcent 4      -180.0    -180.0    -180.0
libamp  4      -180.0    -180.0    -180.0

kozaimean       182.3     181.7     183.2
kozaiamp        180.0     180.0     180.0